Spraying construction



y 1934- w. R. BROWN 1,957,527 SPRAYING GUNSTRUCTION Filed Aug. 19, 1933 7 1 2772 esses': In yen for Patented May 8, 1934 UNITED STATES PATENT oFFIcE This invention relates to liquid atomizers such as required for paint spraying or for other similar purposes such as garden spraying, and the purpose of the invention is to provide improve- 5 ments in the mechanical arangement of a trigger operated spray control means which forms the closure for a liquid container and has provision for the attachment thereto of a fie'xible tube from which air under pressure is received.

The drawing shows a longitudinal section of the improved spraying device in Fig. 1,- and a sectional detail of an alternative form of nozzle inF'ig. 2.

As illustrated the construction consists of a 15 liquid supply chamber in the form of a small paint can and a closing means for the container which is also provided with a handle for manipulating the device and includes a trigger arranged to shift a feed tube for the liquid to be 29 sprayed with reference to the delivery nozzle.

The shifting of the feed'tube with reference to the delivery nozzle varies the effectiveness of the current of air flowing through the nozzle in drawing liquid through the feed tube as assisted by a substantially uniform air pressure above the surface of the liquid in the container.

"The liquid container 1 is illustrated. as having a threaded neck 2 to which is applied a cover 3, a gasket 4 providing a seal between the cover and the container. The cover 3 is a casting having an integral handle 5 to which is pivoted a trigger 6 arranged for shifting a rod 7 slidable ,in a bore 8 extending transversely through the cover.

The rod- '7 is threaded at the trigger end to re-- 'ceive a spring ten'sioning nut 9. 7 The spring 10 bears between the nut 9 and the packing 11. Opposite the packing end of the bore 8,"the latter terminatesin an enlargement9 of the bore which allows for an air space 12 surrounding the en- 0 larged hollow end 13of rod 7. X r

The air space 12 communicates with the interior oflthe liquid container through the opening 14. Air under pressure is supplied to the space-12 and to the space in the container above the level of they liquid therein through theaperture in the threaded boss 15 on the top of the cover and to which a flexible tube is attached; The tube leads to a source of air under pressure. The hollow end 13 of rod 8 has a threaded aperture for receiving a depending tube 16 which extends downwardly to near the bottom of container 1, and transmits liquid from the bottom of the container to the hollow end of rod 7 according to the difference in pressure of the air in the container and the pressureat the end of a deliverytube 17, which is carried by and fits-into the end of the hollow enlargement 13 of rod 7. 1

The nozzle 18 is threaded to the projecting por-v 'tion 19 of cover 3 and surrounding the end of delivery tube 17. The tapered inner surface 20 of the nozzle 18 directs the air flowing outwardly I through the jet orifice 21 of the nozzle over 'the outer edge of delivery tube 17, thus causing a 68 reduction in pressure at the end of the tube according to the position of the end of the tube with reference to the nozzle. This position is varied by theoperator according to the desired 1 ,rod 8 and the tubes carried thereby to the left,

in.orde'r to cause a restriction in the air passage- Way surrounding the end of'tube 1'7. 1 'I'he resulting reduction in pressure atthe end of'tube 17 according to the adjustment effected by trigger 6, determines the .e'fiectiveness of the air pressure above the liquid in causing its flow 88 through the atomizing nozzle.

The alternative form of nozzle illustrated by' Fig. 2 is used for some classes of work where it is desired to apply the paint by means of a fiattened out jet,-.whereas the nozzle shown in Fig. 1 90 produces a conical jet. )The two nozzles-are substantially, same in regard to producing atomization withinthe nozzle and then allowing it to leave through the aperture 21, Fig. 1, or the aperture 22, Fig. 2, in a conical jet, but the nozzle 96 in Fig. 2 has additional air jet orifices 23 for producing streams of air at an angle toward the jet from orifice 22, thus flattening or fanning out the jet from orifice 22.

Although but one specific embodiment of this I invention is herein shown and described, it will I I be understood that details of the construction shown may be altered without departing from this invention as defined by the following claims:

I claim: 1. A spray construction, comprising a liquid container and a closing means therefor, said closing means having a bore extending from side to sidethereof, which bore. has an'opening into the container, a nozzle seated at one end of the bore, 1

a conduit arrangement for carrying liquid. from the bottom of said container upwardly through said opening and along said bore to the nozzle, a rod carrying said conduit arrangement and slidable within said bore and projecting therethrough opposite the nozzle end of the bore.

2. A spray construction, comprising a liquid container having a closing means therefor, said closing'means having a bore extending from side to side thereof, which bore has an opening into the container, a nozzle seated at one end of the bore, a conduit arrangement for carrying liquid from the bottom of said container upwardly through said opening and along said bore to the nozzle, a rod carrying said conduit arrangement and slidable within said bore and projecting therethrough opposite the nozzle end of the bore, and means carried by the cover for shifting saidrod for the purpose of regulating the position of the outlet of the conduit arrangement with reference to the nozzle.

3. A spray construction, comprising a liquid container and a closing means therefor, said closing means having a bore extending from side to side thereof, which bore has an opening into the container, a nozzle seated at one end of the bore,

a conduit arrangement for carrying liquid from the bottom of said container upwardly through said opening and along said bore to the nozzle, a rod carrying said conduit arrangement and slidable within said bore and projecting therethrough opposite the nozzle end of the bore, a packing surrounding said rod near its projecting end, spring retaining means on the projecting end of the rod, and a coil spring surrounding said rod between the retaining means and the pack- 4. A spray construction, comprising a liquid container and a closing means therefor, said closing means having a bore extending from side to side thereof, which bore has an opening into the container, a nozzle seated at one end of the bore, a conduit arrangement for carrying liquid from the bottom of said container upwardly through said opening and along said bore to the nozzle, 2. rod carrying said conduit arrangement and slidable within said bore and projecting therethrough opposite the nozzle end of the bore, and a trigger pivoted to said cover in position for engaging the end of the rod and adjusting the rod and conduit arrangement carried thereby against the action of said spring.

WILLIAM R. BROWN. 

